Elenco Electronics EP-130, Руководство пользователя

Страница: 21 / 160

-21-
Do you want to perk up the ears of some of your
elders? Anyone who has lived in a house with a
grandfather clock will think you have one when they
hear this project.
The circuit produces clicks at approximately one
second intervals. The timing and sound together will
remind you of an old grandfather clock. You can
change the 100k
Ω
resistor to obtain faster or slower
pulse rates.
The steady monotonous ticking can put animals
(and people) into a restful state of mind. If you have
traveled on a train, you know how sleepy you get as
you hear the click, click, click of the wheels.
Now, want to scare this “clock” to stop? Yell into the
speaker. How about that? You can momentarily stop
the clock! The speaker acts as a microphone. The
sound of your voice vibrates in the speaker and
upsets the electrical balance of the circuit
momentarily.
Notes:
EXPERIMENT #10: ELECTRONIC GRANDFATHER CLOCK
Wiring Sequence:
o
1-29
o
2-30
o
3-104-116
o
4-90-120
o
5-41-103
o
40-72
o
42-119
o
71-89-115
Schematic